QP bug reported over at Fixpack forums:

[CamDawg]

Mirik:

Version of Game:ToB
Mods Installed: BG2FIXPACK
                        D0QUESTPACK
                        UB
                       
Description of Problem: Well, first of all sorry for my English . The problem is that the YuanTe - Mage on the second floor of The De'Arnis keep does not cast ANY magic on me and/or my party. It just starts melee combat  with us.

I made some investigation. I used Infinity Explorer and checked its .cre file.  It is called 'kpsham01.cre' and in the AI tag its class was assigned to 'MAGE12Dg' script. I tried to find such script, but failed. 

Thats all. By the way. Happy New Year!!!
Thanks folks for what You are doing and Long Live Battleground Infinity!!!

CamDawg:

It's a Quest Pack bug:

Code: [Select]

// These guys need script order changes
COPY_EXISTING ~kpsham01.cre~ ~override~
WRITE_ASCII 0x248 "SHOUTDLG"
WRITE_ASCII 0x250 "MAGE12D"
should be

Code: [Select]

// These guys need script order changes
COPY_EXISTING ~kpsham01.cre~ ~override~
WRITE_ASCII 0x248 "SHOUTDLG"
WRITE_ASCII 0x250 "MAGE12D" #8